Re: Local tracking

From: Peter H. L. Christiansen (pchristi@nbi.dk)
Date: Fri Sep 08 2000 - 08:51:08 EDT

  • Next message: Djamel Ouerdane: "tpc tracking"

    Hi
    
    I have some further info about this.
    
    I have updated my version of brat and nothing changes for the real data. I
    don't think the window size has any effect on this and I use the same
    window myself with real data and have no problems in TPM2, T1, T2. It is
    harder to say for TPM1 becuase it is so messy.
    
    The problem in Djamels case is that only 4 clusters are found from the
    clustering, however there are also only 20 something TPC sequences when we
    looked.
    
    My suggestion is to print out the row numbers for all the TPC sequences
    and see if they are all there.
    If not :
       dig problem. Set Debug Level and look what goes wrong.
    If all rows are there and correct and min 2 sequence pr row :
       cluster problem - hard to beleive
    If the rows are not correct :
       geometry problem
    If there is only 1 sequence pr row :
       dig parameter problem - gain/n e- changed 
    
    > I put a debug level in trackDummy (BrTrackFollowFinder) and noticed that
    > some local tracks do exist but it seems that they are not added to the
    > track tables (apparently) so that they remain empty in the event node.
    
    Not true. The track direction etc. you get with a high debug level are 
    track segments that are eventually the tracks if #hits in the segment is
    high enough (Number of active rows - allowed to miss (3 is default I
    think). 
    You should look at No. of track groups and number of local tracks. Track
    groups are groups of local tracks sharing many hits. Track groups are
    eventually reduced to one BrDetectorTrack pr group.
    
    Ciao
       Peter
    



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